3,5-二(乙氧羰基)-4-甲基-1H-吡咯-2-羧酸

2,4-二甲基吡咯-3,5-二羧酸二乙酯

3-cyano-4-methyl-pyrrole-2,5-dicarboxylic acid

ethyl 4-cyano-3,5-dimethyl-1H-pyrrole-2-carboxylate

4-chlorocarbonyl-3,5-dimethyl-pyrrole-2-carboxylic acid ethyl ester